# CVE-2023-38407: Denial of service in n/a

> An attacker can cause a denial of service in FRRouting by triggering an out-of-bounds read during labeled unicast parsing.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 6 Nov 2023
- **Updated:** 4 Nov 2025
- **Also known as:** DEBIAN-CVE-2023-38407, GHSA-38fw-5cvw-p8h6, UBUNTU-CVE-2023-38407

## What is CVE-2023-38407?

CVE-2023-38407 is a high-severity denial of service vulnerability in n/a, published on 6 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

bgpd/bgp_label.c in FRRouting (FRR) before 8.5 attempts to read beyond the end of the stream during labeled unicast parsing.

## Which versions are affected by CVE-2023-38407?

It affects 1 product.


Products: Frrouting Frrouting.

## How do I fix CVE-2023-38407?

Upgrade to a fixed version.

## Is CVE-2023-38407 being exploited?

There is no known exploitation of CVE-2023-38407 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2024-44070](https://insights.sbomify.com/CVE-2024-44070/): Denial of service in n/a (critical 9.8)
- [CVE-2023-38406](https://insights.sbomify.com/CVE-2023-38406/): bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow." (critical 9.8)
- [CVE-2022-37035](https://insights.sbomify.com/CVE-2022-37035/): Use after free in n/a (high 8.1)
- [CVE-2022-26127](https://insights.sbomify.com/CVE-2022-26127/): Memory corruption in FRRouting (high 7.8)
- [CVE-2022-26128](https://insights.sbomify.com/CVE-2022-26128/): Memory corruption in FRRouting (high 7.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2023-38407 and fix it if it is affected.

What it is: CVE-2023-38407 is a high-severity denial of service vulnerability in n/a, published on 6 Nov 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2023-38407 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2023-38407/ (Markdown: https://insights.sbomify.com/CVE-2023-38407/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2023-38407
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-38407
- OSV: https://osv.dev/vulnerability/CVE-2023-38407

---
From sbomify Insights: https://insights.sbomify.com/CVE-2023-38407/
Summaries are generated and may contain mistakes; the official description above is the record.